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Property Dispositions and Real Estate Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
property
Mar. 31, 2016
USD ($)
Dec. 31, 2016
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Debt satisfaction charges, net $ 0 $ 162  
Impairment of real estate $ 2,698    
Number of real estate properties held for sale | property 1   2
Transferred Property [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Debt satisfaction charges, net   162  
Transferred Property [Member] | Office Building [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Aggregate gross disposition price $ 92,756    
Real estate disposition price   400  
Sold Properties [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Aggregate gross disposition price   58,225  
Gain on sale of properties $ 34,193 $ 17,015